package cn.itcast.netty.advance.c1;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.AdaptiveRecvByteBufAllocator;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import lombok.extern.slf4j.Slf4j;

/**
 * className: HelloWorldServer
 * description:
 * date: 2024/6/11-8:55
 * <p>
 * project: netty-demo
 * package: cn.itcast.netty.advance
 * email: 1085844536@qq.com
 * version:
 *
 * @author WangGuojian
 */
@Slf4j
public class HelloWorldServer {

    void start() {
        NioEventLoopGroup boss = new NioEventLoopGroup();
        NioEventLoopGroup worker = new NioEventLoopGroup();
        try {
            ServerBootstrap serverBootstrap = new ServerBootstrap();
            // 调整系统的接收缓冲区(滑动窗口)
            // serverBootstrap.option(ChannelOption.SO_RCVBUF, 10);
            // 调整netty的接收缓冲区(byteBuf)
            serverBootstrap.childOption(ChannelOption.RCVBUF_ALLOCATOR, new AdaptiveRecvByteBufAllocator(16, 16, 16));
            serverBootstrap.group(boss, worker);
            serverBootstrap.channel(NioServerSocketChannel.class);
            serverBootstrap.childHandler(new ChannelInitializer<SocketChannel>() {
                @Override
                protected void initChannel(SocketChannel socketChannel) throws Exception {
                    socketChannel.pipeline().addLast(new LoggingHandler(LogLevel.DEBUG));
                }
            });

            ChannelFuture channelFuture = serverBootstrap.bind(8080);
            channelFuture.channel().closeFuture().sync();
        } catch (InterruptedException e) {
            log.error("server error", e);
        } finally {
            boss.shutdownGracefully();
            worker.shutdownGracefully();
        }
    }

    public static void main(String[] args) {
        new HelloWorldServer().start();
    }
}
